Getting a Crosman 140 Working, Part 1

Well, I bought another "pile-o-parts" airgun, a Crosman 140. It was mostly in pieces so I took everything else apart and cleaned the gunk off.

The main parts. Not shown are the pump components, stock, tube and the barrel

The valve. It's a pop-off valve, held under pressure by the sear. When the trigger is released the cap at the right pops off and releases the air.

The piston rod that came with the rifle is at the bottom. Someone tried unsuccessfully to remove the old seal, and did what looks like a bunch of grinding on it. The top rod assembly came as a spare with the Crosman 101 pile-o-parts I bought a while back. So I figured that I'd use it instead.

The 101 piston parts, and a new seal that also came with the 101. Since I'm nowhere near close to working on the 101 I figured I'd use it here.

The new piston head.

The valve o-rings were removed and replaced with new ones. The pop off valve has an internal quad seal. Later on in the process I ended up replacing it with an o-ring which will probably not last. I'll be ordering in the proper seal soon.

The assembled valve. Those marks were made by the previous owner. Really...

The valve is held in by the stock screw. I wish it had flats on it for a wrench.

The pivot pin is a spring pin. How I hate pushing it in and out when setting the optimum piston rod distance, as well as getting the valve assembled correctly.

The trigger group looks a lot like the 160 trigger, but is simpler as it only retains the "hammer" against the valve pressure. The front screw holding it to the tube is temporary. I didn't bother putting the barrel on yet.